Telephone system



n Oct. 15, 1929. R. F. STI-:HUK 1,732,185

TELEPHONE SYSTEM original Filed oct. 18, 1926 5 sheets-sheet l 17E WCE azf v5 sheets-sheet 2 Original Filed OGC: 18, 1926 dmrfmmm.

AQGFZOO Imi; ZjnZ-L F. SE1-Lilli OC. l5, 1929. y R; F, sTEHLlK 1,732,185

TELEPHONE SYSTEM Original Filed Oct. 18, 1926 5 Sheets-Sheet 5 SENDER COUNTING DEVICE 32|- 325 -STEP RELAYS PICK-UP STOP nELAYs NOTE- ARE TWO Oct. 15, 1929. R. F. sTEHLlK TELEPHONE SYSTEM Original Filed Oct. 18, 1926 5 Sheets-Sheet 4 muh-UE mnou wa. man *ou du NoN SN R. F. STEHLIK TELEPHONE SYSTEM riginal Filed oct. 18. 192s L@ N moml om om AQ oct. 15, 1929.

Patented Oct. 15, 1929 i @entre 'srATEs RUDCLPI'I F. STE'HLIK, CHICAGO, ILLINOIS, ASSIGNOR TO AUTOMATIC ELECTRIC BTQ, OF 'C'HCAGQ LLINOIS, A CRPORATION OF v'1)EL."AAIB'IE'J TELEHoNE sYs'rninv T he present invention relates to telephone systems, 'but is concerned more particularly f with 'telephone systems vin which register senders are employed, and the principal ob-v ject maybe stated'b'rieiy'to be the'production of 'a new 'and improved register sender in `ivhich the 'functions previously vperformed by switching mechanisms of the progres sively movable type are performed by groups g of relays in order that .theuseful life'of the device as a Whole maybe considerably prolonged, it lbeing' Well 'kno'vin of course that a relay device Will last 'practically an indefinite length of time, Whereas a progressively mov- 1 able switch 'may Wear out in acompa'ratively short timein case it is subjected to'frequent use, as is `the'c'ase when vit is employed 'in a register sender. Y

The type'of register sender Yvv'ith vWhich this invention is concerned 'is that type which has come to Abe known as the director A director is used primarily to promote Vtrunk efficiency by accomplishing a translation Aso that lthe digit combination -retransmitted to effectthe trunking of a call to ya'desired office may consist of any desired number of digits ofl any'desired value Without regard to the particular combination of office digits registered. Specifically, the director reg- 4isters the Aofhce digits lof a telephone number and retransmits lin response thereto the code digits necessary to trunk the call tothe desired office, land it registers Vand 'retransmits unchanged ythe 'line designating digits `of the number. y

A further object of the invention may be stated to be the production of a neiv and iinproved arrangement of counting vrelays whereby the number of relays necessary to replace the step-by-step switches 'is vreduced to a minimum. In general, this. is accolmplished by using what Will be termed hereinafter a. reflex arrangement. According to the reiier; arrangement, the circuits of the counting relays are arranged so-,that one or more of therelays yare usedtvvo ormoretimes to record tthe'maximum series lof impulses, thereby reducing the number of relays considerably belou7 the requirementsof a nonrefieXed arrangement,

y Another object lis the vreduction 'in the numberof storage devices Yused to lstore the line designating digits, these devices being reduced from four to three. In'orde'r to accomplish this object, the first three line'designating digits that. are received arest-ored on the three storage devicesfprovided and the fourth line 'designating digit is retained in theregister until 'the iirstline designating digithasbeen retransmitted, and the first register has been cleared out again.

Atfthis point the digit retained on the register is transferred to the 'first line-desig- 'nating'storage device and is retransmitted after the digit rstored on xthe thi-rd ystorage device has been ysent out.

A further object Vof 'the invention is the provision of 'a novel arrangement for causingthe relays of the Joutput control device to operate one after another in quick suc-v cession so as to advance the device through unneeded code-digit positions.

' A special feature ofthe present arrangement is that no Vspecial provisions need be made in case it is desired to 'cancel all the code digits positions, thus automatically vviping out the edect of the setting of the 'office register.

There `vare other objects and 'features of 'the invention having to do for the most lpart with the "necessary provision of practical ar- All the objects and features Will objects.

upon a further perusal of become apparent the specification.

Referring now to the accompanying 'drawings comprising Figs. 1-9, they show lby means of thev usual circuit diagrams a sufficient amount ofapparatus employed in a telephone system embodying the features of the 'invention to enable vthe invention to be understood. Fig. l shows certain equipment used to set up a telephone connection; Figs. 245 show one of the directors that may be 'taken into use by the director selector DS, Fig. 1,'tocontrol the setting up of a connection.;and Figs. 6-9 are tables showing, among other things, the operating order of the relays comprising certain devices of the di- 303, labeled Switching Specifically, Fig. l shows the line ot substation A terminating at the telephone eX- change in the lineswitch LS. The lineswitch LS has access to a number of selectors. One of these selectors is the selector S. The trunk circuit TC is inserted in the trunk line between the bank ot the lineswitch LS and the selector S to permit a. director to be taken into use upon the seizure of the trunk line. The selection ot an idle director is accomplished by the director selector DS.

Referring now to Figs. .2*5, the portion of the director shown in Fig. 2 includes the output-control device comprising relays Q01-Q06. By the operation of these relays during the retransmitting process, the device is caused to assume dilferent positions so as to control the successive digits. This device also brings about the switch-through operation so as to cause the director to be treed and the trunl circuit TC, Fig. 1, to be 'witched through when the director has completed the retransmission. F ig. 2 shows also the input-control device comprising relays Q07 and 203. rlhese relays are operated automaticallyA between received series of iinpulses so as to direct the lirst two series oi impulses to the operating magnets of the otiice register OR, Fig. Ll, and to direct the remaining series of impulses to the register comprising relays .2H-215. '1`heinput-control device also performs certain other functions as will hereinafter appear. y

rThe register comprising` relays 211-215 records the four line-designating digits in the number, the digits being transferred one at a time to the storage devices shown in Fig. 5.

Regarding the equipmentV shown in Fig. 3, it will be noted that this drawing shows the control relays 301-310 and the sender counting device comprising relays 321-325- This counting derice operates each time adigitv transmitted and counts the transmitted impulses so that the sending operation may be terminated at a predetermined point.

' .Relay 301, it will be n-oted, is labeled Guard. rl1 his relay operates to guard-the 'director al winst seizure during the releasing operat1 n oi the ofhce register' OR, Fig.v t, by

grounding the release trunk conductor 132 in r manner to be hereinafter explained. Relay 302, labeled Rise is the release relay and it is operated over conductor '132 when the director is seized. This relay might also be tern'led a. holding relay it so desired'. Relay g, is the switching ren thatit operated at the completion e operation ofthe director to bring about the freeing ot the-director and the switching rough et the connection `by operating tching relay 10G of the trunk circuit TC,

1Q Relay 304-, labeled Rec-Stop is termreceiving-stop-relay becauseA it is operer when all digits have been received by the director to open the impulse conductor at armature 341 so as to prevent any turther operation of the registering device shown in Fig. 2. This relay also performs another function as will be hereinafter explained. Relay 305, labeled Repeating, is the repeating relay. rlhis relay repeats the impulses received over the impulse conductor 131 to the registering portion ol 'the director over conductor 233. Relay 306, labeled Series, is the series relay in that it responds at the beginning o a series ot impulses and remains operated until the series ot impulses has been terminated. Relay 307, labeled Series-Step, is theseries-step relay in that it operates in conjunction with series relay 306 to produce the stepping action or' the input control device, Fig. 2. It will be noted that relay 307 is shunted with a resistance. This resistance is shunted around the relay so as to make it slightly slow to tall back after its circuit is opened. By choosing the proper value oi the resist-ance to place in shunt of relay and by properly adjusting the relay, the time requirec for the relay to fall back atter its circuit is opened can be adjusted very detinitely so that ntlicient time is allowed tor the steppng operation or the input control device to take place without any danger olf the relay holding up so long as to be still operated 'when the next series of impulses is received. rlhe remaining relays-303-310 are associated with the sender counting device, the whole forming the sender proper. Relay 303 is the pick-up relay and it operates at the end of the lirst etiective step of the sender counting device to remove the shunt at armature 3459 from around the sendingI contacts 354 so as to synchronize the counting operations; and sending relay 309 is the stop relay and it is operated by the sender counting device in accordance with the position of the instant active register or storage device to stop the sending operation by opening the circuit oit sending relay 310 at armature 353; and relay 310 is the sending relay as its name applies, the sending operation being performed at armature lt will be noted that each time sending relay 310 operates to open the outgoing control circuit at armature 354 it sends an impulse over conductor 320 to advance the sender count- Y ies type, .raisingk its wipers opposite the desired level of bank contacts upon the iirst digit and rotating them intoengagement with the de-v sired set ot bank contacts on the second digit. Only one Contact set in the banket the cnice register GR, the 34th, is shown. It may be pointed out that, while the other switch mechanisms te Tmerly used in directors, have been replaced by relays, it has not vbeen considered to replace the oliice register OR by relays on account oi` the fact that the life ot switches oi this type is great and also on account ofthe complex and expensive relay arrangement required to replace it. Fig. 4 of the drawing shows also the intermediate distributing frame lill?. This trameis interposed between the bank of the ottice register @R- and the various impulse stop conductor and the skip conductor 209. At this point it may be well'to mention that vthe circles connected with the contacts on the right-hand side of the 1.13.1?. indicates the terminals that are to be connected to terminals indicated. by corresponding circles shown in Figs. 3 and 5 association with the sender counting device and the line-designatingdigit storage devices.

5 shows the three line-designatingdigit storage devices Til-U, lil, and T. The iirst device, comprising relays ALL-D1, stores the thousands digit; the second device, comprising relays A2-D2, stores 'the hundreds digits; the third device, comprising relays Aff-D3, stores the tens digits; and the Vfirst device TH-U is reoperated, after the thousands digit has been retransmitted, to store the units digits, thereby lobviating a fourth storage device. Fig. 5 shows also ythe three connecting relays 504-506 which operate to connect the setting yconductors 241-244 to the storage devices fin orden These connecting relays are in turnfcontrolled by the relays 501-503 in a manner to be subsequently eX- plained.

In order that the invention may be understood best, a detailed description of theoperation of the apparatus shown will now be given. For this purpose it will be assumed thatthe subscriber at substation A, Fig. l, desires to call a subscriber whose line terminates in oiiice 34, and whose 'line number is 0534. Consequently, the complete number may appear in the directory a's 3440534. As will be later explained the oiiice designation, 34, is translated intothe code 058, the complete retransmitted number being 058-0'534 Selection of "idle director p l/Vhen thesubseriber at substation A reates in the well known manner to select 'idle trunk line. Assuming that thetrunk `Vue comprising Vconductors l10i-103 :eX-

tending to the lselector S through the trunk -circuit TC usthe one selected, line relay 104 operates over the calling line and at armature '107 closes a circuit 4tor relays 105 and 10G in series. Relay 1105 operates in series with re,

Ilay 106, but the latter relayis lnot loperated `lay i104 are 1in Contact. rflhis, rlio-.vever,'does resultinithe'operation of relay 106 owing to Vthe fact -thatthe stroke ofthe armature `properlo'li relay '104 is completed'be'tore relay 105 can start to operate. rAtarmature i108, relay 105 .places ground on release trunk conductor 102 so as to maintain the lineswitch LS operated and to maintain the trunk line busy to the'other'switches having access to it.

t armature '110 relay 105 closes la circuit through relay 121 and stepping magnet 122 in series, and at armature 109 it connects the junction of relay 121 and magnet 122 through armature 124, normal, to test wiper 123. ln case -the contact set on which ithe wipers are standing is idle,this latter operation is of no e'ect and relay 121 operates immediately, seizing the contact set. Assuming that the vdirector connected withthe contact set is in use, a ground potential is encountered bytest wiper 128, short circuiting relay 121 and att iording a direct circuit for magnet 122. Ac cordinely, the wipers .127-130 are advanced `in the yusual buzzer-like manner by magnet 122 until an idle contact set is v reached. When an idle contact set is reached, for eX- aniple, the contact set to which the conduce tors 131-134 are connected, the 'buzzer-:like action of magnet 122 ceases, and relay 121, being no longer short circuited, operates in series with vmagnet 122. Magnet 122 it may be stated, .will not'opera'te'in series with'relay 121 owing to the relatively high resistance of the relay. At armature 124, relay 121 opens a point in the 'test circuit and places ground on test Wiper 123 so as to make the seized contact set busy immediately, and at armatures 123, 125, and 120 it connects up the remaining wipers of the switch. As a result of the connecting up ot wipers 129y and 130, the line relay (not shown) ot the selector S operates over conductors 133 and 134 of the director to which the said conductors extend. vis the result oi the operation of its line relay, the selector S is prepared for the reception of impulses. Y

ln the director, lthe release relay302 is ope ated through armature 331, normal, of relay 301 responsive to the grounding of conductor 132 through the test wiper128 ot theA director selector BS. At armature 336, relay 302 closes a circuit tor lamp 338 so that the busy condition of the director may be apparent to an attendant; it grounds the locking conn yductor 240 "at armature33f? and at armature f 335 it opens a point in the circuit of release magnet 409 of the office register OR before. 1t will be noted that, with wiper 127 of the director selector DS connected up at armature 123 of relay 121, repeating relay 305 is connected through armature 339, normal, and conductor 131 to the winding of release relay 105, Fig. 1, in multiple with switching relay 106. Repeating relay 305 is not operated at this time in series with relay 105 owing to the fact that its winding has fewer turns than that of relay 105. It will be noted that a connection yexists between the free terminal of the secondary winding of the common dial tone transformer 246, F ig. 2, and the impulse conductor 131. This connection includes the condenser 247, outer-right-hand armature of relay 207, and armature 339, normal, of relay 303. Accordingly, the dial tone current passes up the impulse conductor 131 to the trunk circuit TC and thence through the condenser in the trunk circuit TC to the lower talking conductor 103 by way of armature 113, normal. The calling subscriber, upon hearing this dial tone, is informed that he may now proceed to dial the digits in the desired number.

Reg/Stratton of called afa/mbe?" When the calling subscriber dials the first digit 3, line relay 104 is caused to fall back three times momentarily. Each time it falls back, it shunts relay 105, thereby closing a direct circuit for repeating relay 305 over conductor 131, and it disconnects the switching relay 106 so as to prevent the operation of this relayat this time. Repeating relay 305 operates each time relay 105 is shunted and it restores each time the shunt is removed from around the winding of relay 105. The result is three momentary operations of the relay 305. It may be mentioned at this time that relay 105 remains operated during the operation of line relay 104 owing to the fact that the magnetic flux persists due to the self-induced current in the shunted winding.

Each time relay 305 operates in the foregoing manner, it closes at armature 344 a circuit through armature 341 and over conductor 236 for the vertical magnet 408 of the office register OR. This circuit includes the outer left-hand armature, normal, ofrelay 207 and branch cenductor 217. In response to the three impulses of Current, the vertical magnet 408 of the office register OR raises the wipers 401-406 step-by-step until they arrive opposite the third level of bank contacts.

As a further result of each energization of repeating relay 305, it closes at armature 345 a circuit for the slow acting series relay 306. Relay 306 operates when its circuit is first closed and maintains its energization throughout the series of impulses. At armature 347, relay 306 closes a circuit through armature 343, normal, for relay 307. Relay 307 operates and at armature 348 prepares a circuit for advancing the input control device.

VVhen the repeating relay 305 comes to rest, relay 306 falls baclr and at armature 347 places ground on conductor 239 through armature 348. An instant later relay 307, which is only slightly slow-acting due to the resistance shunted around its winding, falls back and again removes ground from. conductor 239 at armature 348. When ground is applied to conductor 239 a circuit is closed through the inner right-hand armature, normal, of relay 207 for the left-hand winding of the said relay. When energized throughy the left-hand winding alone, relay .7 operates through its first step only, closing only the contacts marked X. 1t may be pointed out at this time that throughout the drawings the letter X has been used to indicate contacts that operate first. Upon the closure vof the first step contacts of relay 207 a locking circuit fcr both windings in series is closed including the locking cenductor 240. rEhe lefthand winding of relay 207 does not receive current at this time owing to the fact that it is furnished with ground potential at both of its terminals. -When the impulse to the right-hand winding of relay 207 is terminated by the falling back of relay 307, the shunt is removed from around the left-hand winding of the relay, whereupon the energization of the relay is increased sufficiently by thelefthand winding to cause the relay to operate through its second step. At its outer left- Y hand armature, relay 207 extends the impulse conductor through the outer left-hand armature, normal, of relay 208 to conductor 218; at its inner right-hand armatureit extends the series stepping conductor 239to relay 208; and at its outer right-hand armature it disconnects, the dial tone conductor 230 from the secondary winding of the dial tone transformer 246. f Y

When the'second digit 4 is dialed, four im pulses of current are delivered over conductor 218 to rotary magnet 407 of the oiice register OR with the result that the wipers 401-406 are set on the 34th set of bank contacts comprising contacts 411-416. By thejoint action of relays 306 and 307 an impulse of current is delivered over conductor 239 and through the innerarmatures of relays 207 and 208 to the right-hand winding of relay 208. Relay 208, being similar'to relay 207, operates f through its first step upon the receipt of the impulse of current and it operates through its second stepV upon the termination of the impulse. At its outer left-hand armature, relay 208 eXtends the impulse Conductor 236 to the branch 246 leading to the register comprising relays 211215. At its inner right-hand. armature it shifts the series stepping conductor 239 into connection with the setup conductor 247; and at its outer right-hand armature it places ground on start conductor maag-isa 219 and conductor 220.'- AsfaresultI of the lstorage set arefenergizedlto" store any'digit4 placing of ground lp'otent'ialon conductor 2119,"

the sender shown' iir Fig.- 3l is startedf tore-v transmit the-code digits necessary-'tdtrnnlr'-' the call to the desired oiiioe; ina manner-xtc be subsequently explained. Ets-a' result otthe"I placing olii ground potential; o'nconductor' 220, a circuit'is closed throughy armature'sf5lf5"; 511, and 503 normal, for connecting' rela-y- 504. Relay 504 responds and connects thef set up conductors 2451-244' t'or the; relays@ Al-Dl of the thousands-units storageidevice', preparatory to the .storingfof the thousands digitson-the storage device; i

When the thousands digit Ois dialed, ten'k impulses of current aretransmitted bythe through the inner right-hand armatures of' relays 211-213 to tli'e ri'ghthand Winding of relay 211. Alliot. the relays othe register arel "1 tivo-step relays, operating` through the lirstiv step upon the receipt of an impulse and 'oper-4 ating through. the second step when the' iin'r pulse terminates. rlhe first impulse results-inf the opera-tion of relay 211, whereupon' the imLi pulse conductor is transferred to relay 212/'att the inner right-hand.contact of relay 2111; Inf a similar manner the remaining relays are operated andthe impulse conductor` isY shifted along until relay 215 operates'in` response toI the ifth impulse. It will be noted' that the locking conductor 2415, grounded at armaturef 313 oi relay 307 during the receipt ofanflnnsl pulse series-,is connectedthroughthe lefthand" armatures ofrelays 211-215 inhsu'ch afffmanlner that each of the relaysi'witht'he'exception Y of relay 215 is subsequently unloclrledf'as@thfeI registering operation proceeds, relay 215th@-`v ing arranged to lock directly/toconductor 245. While the relays211--215operate'one*v after another in regular order, asc above" pointed out, to register the irstfiilyeimpulses- The relays 21121t operate in a-soniewfh'atdiilerent manner to register the remaining live impulses, thefcomplete relay operating meer being en, 212, 213,214, 21f5t2ire1i'a1.

213, 214-, and 212.y It-Willbe noted that relay 215 is operated only once; relays 211, 213, 214i are operated twice; and relay 212 is operated three times. The table, Fig. 6',- shows the condition of thel relaysatthe end of each orth'e ten impulses lt may be noted for example that only rel lay 211 is energizedv at the 4endof the i-:ilstinipulse; that-frelays'211 an'ol212 are"energized at the end of the second impulse; thatfrelays` 212 and 2131are energized-at thefend ofthe,Z

third impulse; andthat-all of thefrelays are' energized at the end of the tenth irnpulse;

Referring now to Fig. 7 this table sh'oWs the permutations iny which relaysof an-y1 from-l toOV It Will4 be noted that'relay A* ofanyset is energized alone to store the digit 1l, and thaty relays A and B'd are` energizedtogether to store'the digit 2etci sthe particu'- 'lafr' *digit* registered'` on the 'relaysr'211-215 at the present time-is the digitzO,l aireference toV Fig. shoWs that" relays 'Bland Dior that-set,

Bl and-` D1', sliould' be" operate-d" to1 store the digit;` Accordingly, with alloffthfe relays in* theregister operated', conductors 242land :244' should be connected to the set-upl conductor 247-, and; conductors' 241 and 243l should be ldisconnectedfrom the'said set-up conductor. -A reference to Fig. 2`Will shovi7 that such is now the case; as conductor 221'( is extended through' the middle ri'ghtt-h'and' armature of 'relay` 212, operated, outer 'right-hand' armature ofrrelay'215, operated, andthe''middlev right-hand' armature, operated, of'irelay 214Y UJI Cil

cuits are-complete'dat armature 247 of"V series relay 306 when this relay puts ground onl conductor 239inthe hereinbeforeexplainedl manner through armature-348, conductor 339 now being extended, as l'iereinbel'ore` eirplained, through the inner Y'right-hand arma-v tures of'relay 207- and'208v to conductor 247. Upon operating; relay-'SBv1 and Dr both close locking; circuits forY themselves at their left# hand' armatures, the4 'locking' Icircuits ofl botlr .relays inclu ding relay 501; conductor'210, tWo

armatures in multiple' on relays202ian'd i206",- and theloclringconductor 240.1 No current flows overy this lockingcircu-it'- immediately on account of the factthat theinitialcircuit 'for relays B1 "ancl'D1 is'still ejstablishedl.

When" relay 307 removes ground"trom-*conv ductor 247at armature 348,upon alling'bfack,

it opens-the initie-llcircuitr ilor'relays Bl an'dAv D1 Vwhereupon current'thfroughthese two' -re=-' laysl in li'nultiple is draWir tlirouvglr-relaysl01Q thereby maintaining the storage' relays yopi-V erated and operatinglrelayl 501i.A t'lthe-s'anire time, the locking circuitoffthfe register:relays-4 is opened by the removal Yoffground"from the lockinglconductor 245 at"armature-=3155.'A Re#l ylays 211-2'1'5-now fallback. Relay-501', upon" operating, disconnects conductor 220 iroinfrelay 504 and-extends itt'o -relay 505,` Wh'ere's' upon relay 5021 falls' ba'ckand rel-ay-50i5'operi' ates toi connect uptherelays to th'e seti transmitted over conductor 246, in the manner hereinbefore eXplained,to relaysv 211e- 215. As the second digit is represented by live impulses, the fifth relay 215 responds to the fifth and last impulse, and, as may be seen from Fig. 6, the fourth and fifth relays 214 and 215V are energized at this time, relays 211*213 being normal. Upon reference to Fig. 7, it Will be noted that the digit 5 is stored with the C relay operate-d and With relays A, B, and D normal. Accordingly, upon the grounding of the set-up conduct-or 247 a circuit vis closed through the outer right-hand armatures of relays 211 and 212, normal, the outer right-hand armature of relay 214, over conductor 243 for relay C2. Relay C2 locks itself energized, through its left-hand contacts and through relay 502. When relay 307 falls back, the locked up relays of the register restore and relay 502 operates upon the opening of the initial circuit of relay C2. At armature 511 relay 502 opens the circuit of relay 505 and closes a circuit through relay 506. Relay 506 noW operates and connects i up the relays X3-B3 preparatory to storing the tens digit.

When the calling subscriber dials the tens digit 3, the three impulses received over conductor 24'? are counted by relays 211-213, and relays 212 and 213 remain operated at the end of the series of impulses as may be seen from Fig. 6. With relays 212 and 213 operated, a circuit is closed over conductor 247, upon the deenergization of relay 306, for relay rlhis circuit includes the4 outer right-hand armature, operated, of relay 212 and the outer right-hand armature, normal,

of relay 215, and conductor 242. Relay 503v operates when the initial circuitof relay B3 i is opened upon the falling back of relay 307.

At armature 514, relay 503 opens the circuit of relay 506 and prepares acircuit'for reoperating relay 504. Relay 504 is not reoperated at this time owing to the fact that 's its new circuit is open at armature 509 of relay 501, unless relay 501 has been deenergized in a manner to be pointed out hereinafter. For the purpose of explanation, however, it Will be assumed that relay 501 is still operated. At armature 512, relay 503 prepares a circuit for operating the receiving stop ree lay r304 at the end of the registration of the next and last digit.

When the calling subscriber `dials the last digit 4 in the desired number the four impulses received by the register over the impulse conductor 246 are Counted by the relays 211-214, and the relays 212-214 are operated at the end of the registration, Which may be seen from Fig. 6. The register is noW in readiness to transfer the registrati-on of the digit 4 to the thousands-units register TH-U, but this registration cannot be transferred until the thousands digit has been retransmitted. Upon the Ideenergization of relay 306, ground is again placedV on conductor 239, closing at this time a circuit 'through t-he outer armatures, normal, of relays 201 and 206, conductor 216, armature 512, and nor mally closed contacts controlled by armature 342 for the receivingstop relay 304. Relay 304 operates over this circuit and closes a locking circuit for itself at armature 342, at the same time opening its initial circuit. At armature 341 it opens the impulse conduct-er 236 so that in case the calling subscriber again turns the calling 1device no further impulses Will be delivered to the register. At armature 243, relay 304 opens the initial circuit of the still-operated relay 30'?v and closes a new circuit forthey said relay over the path just traced for relay 304. At armature 32'?, relay 304 shunts armature 347 and its resting contact so asvto prevent the removal of ground from conductor 239 at armature .347 in case the calling subscriber again manipulates his calling device.

In order to enable the description to be understood clearly, it should be remen'ibered at this point that the actual sending operation, although not as yet described, Was starte-d at the end of the setting of the office register OR by the grounding of conductor 210 at the outer right-hand armature of relay 208. rlhe description of the registration and storing of the four line-designating digits has been operation, although proceeding, remains suf- Aficiently behind the registering operation so that the registering operation and the storing process proceed justas 'though the sending operation were not taking place. The se quence of operations taking place in case the calling subscriber dials slowly enough to permit the sending operation to progress further yis slightly 'different than that covered by the foregoing description, as Will be explained more in detail hereinafter. As matters now stand, the thousands, hundreds and tensdigits have been registered andr stored in vthe manner hereinbefore described, on the storage dcvices shown in Fig. 5, and the units digit has been registered, but has not yet been stored, as the thousands-unitsl register is still retaining the thousands digit.

Retransmission middle left-hand armature, normal, of relay 206, start conductor 237, armature 353 of stop relay 309, the interrupter 311, and the sending relay 310. Sending relay 310 according'- ly commences to operate and restore under the control of the interrupter 311. "Each time it operates. it opens a point in the outgoing control circuit including conductors 133 and 134 at its upper armature 354. The iirst operation of armature 354 is shunted at ture 349'ot eich-u @rel-av 303. Each time rcl l. .i

lay 310 operates it sends an-nnpulse of current at armature 355 over conductor 326 to the sender counting device comprising relays 321-325. r1"his counting device controls the operation ot the pick-up and stop relays 308 and 309 and it controls the connection between the stop conductor 356and the ten impulse stop conductors 1 0. rlhese stop conductors, it may be pointed out, are connected in multiple tothe contacts of the storage devices shown in Fig. 5 andto the corresponding terminals on the right-hand side of the intermediate distributing traine, I.D.F., Fig. 4.

rThe first impulse or current transmitted over conductor 326 is delivered through the inner right hand armatures. oty relays 321-324 to the irststep Winding of relay 321, With the resultvv that relay 321 operates through its iirst step when the-impulse is delivered and it operates through its second step when the impulse is terminated, the relay be ing locked at, its inner lett-hand armature to to the grounded. conductor 357 through the outer left-hand armature, normal, of relay 322. Since ten impulses must be counted when the digit-0 iste be transmitted and since the sender counting devi-ce must go through a preliminaryA pick-up step before starting to count impulses, there are eleven different positions that inustkbe assumed hy the relays ot the sender counting device When the digit 0 is to be transmitted. The condition of the relays at the end oi any. one of the impulses is shown by thetable-given in Fig. 8. The relay operating` order itvrnay be pointed out is321, 322. 323, 324, 325` 321, 322, 323, 324, 322, 323, as may be seen from the table given in Fig. 3.

When relay 321 operates through its second step at the end the first impulse transmitted over conductor 326, it closes at its middle lett-hand larmature a circuit for pick-up relay 350 including conductor 357'. Pick-up relay 308 thereupon operates and locks itself to conductor 357 at armature 351. At arma ture 350, relay 308 prepares a locking circuit for stop relay 309, and at armature 349`it-.re-l

moves the shi".` t from around the sending contacts 354.= lisa result, each subsequent energization of ,sending relay 310 results in the interruption otthe outooinfr control circuit at armature 354. Upon referring to the grounded normally through the outerrighthand armatures o1V the output controlrelays,

is extending ground through bank contact` 411, on which it isnoivistanding, and the associatedlDF: jumper to the tenth impulse stop conductor 0. This stop conductor is not f connected With lthe stop-relayy conductor. 356

until' the sender counting device has;` counted; ten transmitted impulses, at which' timel the relays are all s energized as maybe seen, from@ Fig. 8. A. circuitis thencompleted.forstop relay 309 from the grounded conductor 0 70,v

through the corresponding-armature of relay 323, middle right-hand, armature' ot. re lay 322, middle..righthandarmature*of relay.' 324, outer right-hand'arrn irerot relay 3.21,"

outer right-hand armaturesot relay 325andf 75..

the stop-relayy conductor, 356K., Relay 309; operatesover thisicireuit'rand at-itsilightly, adjusted armature spring;-352close s` a loci circuity toritselt before it removes ground.7

from conductor 323 at.arnflature.353..A When 80,.y

the circ-uit ot the stoprelay309 isA closed, parallel circuitf exists throughconductor `233 and the inner rightfhand' armatures, normah of relays 20L-205 for the first-,stepy Winding of relay 201, Relay20l,operatesfgthrouglrits 85,

and this relay falls back after ashort in- 95 terval of time and opens the circuit, offfstop relay 309 at armature 35,0, yat the same time opening a further point invitsovvn previouslyestablished locking circuit and again shunting contacts 354. Whenthe circuit of stop relay309 is opened, `the branch .circuitfincludf` ing'conductor 238:l and extending to thek fir-st.- step Winding of. relay 201; is, also opened, With I the result-y that relayl 201 operates.

through its, second step. At itsouter left- 105.

hand armature, relay 2401j removes ground from4 the. first` Wiper- 401 of the otlice register f kOR and connects it Ato the second'wiper 402.

After a slight interval following the openingfof itscircuitat armature, 35.0; ot piclnup 1m,`

relay 30.8,.stoprelay` 309 falls back and-starts the sender-.to transmit,thenextfcode digit, by, replacing ground romstart conductor-237on conductor, 357 at armature, 353.V When-sending relay 3101startsytogoperateagain due tok 1151.',

the grounding:y of conductorl 357, the. sendery count-ing device goes through itspick-up posi*y tion `inthe hereinbefore. deseribed man-ner,l operating picky-,up relay308'.; Following this,v

the.` relays 322, 323, 324, and 325 operate in regular order and relay 321 reoperates. When relay 321 has' reoperated, iveimpulses have been` retransmitted bythe sending.` relay 310. Stop relay 309izis .noW'operatedoven theA fifth impulse step conductor. 322-324 have been released, and only relays. 321 and 325 re1nain,operated,as may bie conirmed upon reference. to Fig; 8. The circuit over Which relay. 309\is operated at .this ftime includes `the fifth impulse stopA .conductorl 5, 130

In addition, the 90.-

Relays outer right-hand armature,operated, of relay 321, outer right-hand armature o ierated of relay 325, and conductor 356. By the operation of stop relay 309, the second code digit 5 is terminated in the manner hereinbefore explained, and another impulse of current is delivered over conductor 238 to the output control device, operating the second relay 202 to shift the ground potential from the second Wiper 402 of the oiiice register 0B; to the third Wiper 403. The third Wiper 403 is standing on the bank contact 413 Which is connected With the eighth impulse stop conv ductor 8. Accordingly, the third code digit 8 is retransmitted when the sender again starts and it is terminated upon the operation of stop relay 309 upon the termination of the eighth transmitted impulse. [it this time the relays 321, 324, and 325 are operated as may be confirmed upon looking at the chart in F ig. 8. The circuit of stop relay 300 this time includes the eighth impulse stop conductor 3, middle right-hand arniature of relay 324, outer right-hand armature of relay 321, and the outer right-hand armature of relay 325.

The output control device receives another impulse of current over conductor during the time that the stop relay circuit is closed, and the third relay 203 is operated to shift the ground potential from the third to the fourth Wiper of the ollice register OR When the stop relay circuit isopened by the falling bacl: pick-up relay 350. rlhe Vbanlr contacts 414, 415, and 416, it will be noted, are cross-Connected on the 1.13.1?. to skip conductor 209. The result is that when bank contact 414 is grounded through Wiper 404, upon the operation of relay 203, a circuit is closed over conductor 209 and the resistance 229 for the first-step Winding of the fourth output control relay 204, through the inner left-hand armatures of relays 205, 204, and 203. A branch circuit exists over conductor 238 for maintaining stop relay 309 operated. Due tothe fact that resistance 229 is included in its circuit, the righthand Winding of relay 204 is not short circuited When the locking contact, the inner right-hand Contact, closes, and the relay operates through its second step right away, transferring the skip circuit relay 205 and transferring ground from Wiper 404 to Wiper 405. For the same reason, relay 205 operates through the fifth Wiper 405 of the oice register OR and the skip conductor 200, and it transfers the skip conductor to the sixth relay 200 and transfers ground to the sixt-l1 Wiper 405 of the office register 0R. A circuit is now closed for relay 206, and this relay operates in the same manner as relays 204 and 205 operated. l/Vhen relay 206 operates, it transfers ground from the sixth Wiper 400 of the oliice register @P to the thousands digit stop co-nductor 231 through the second left-hand armatures, nornasales mal, of relays 20L-204, relays 201-204 hav`- ing been restored (see Fig. 9). yRelay206 at its middle left-hand armature disconnects the grounded conductor 219 from the start conducto-r 237 and connects it instead through the corresponding armatures, normal, of relays 201-203 tobranch conductor 241. rlhis is done so that the further operation of the sending apparatus is dependent upon Whether or not the first line designating digit has `been registered and stored on the thousands digit storage device. According to the previous assumption, this has been done, and branch conductor 251, now grounded, is connected to starU conductor 23? at armature 507 ofrelay 501. rllhe result is that conductor 237 is still provided with a ground potential to enable the sending apparatus to start again when stop relay 309y falls back. At this point it is Well to remember that, during the skipping operation above described, stop relay 309 is maintained operated over conductor 233, thereby preventing any possibility of the restarting of the sender before the output control device has arrived in a position to control the thousands digit.

lhen the sender is again started, the digit 0, registered on the thousands-units register,

VF 5, is retransmitted. When the last impulse is terminated, stop relay 309, Fig. 3, is connected to the tenth impulse stop conductor, and is operated through the grounded thousands digit stop conductor 231, conductor 231 being connected to the tenth impulse stop conductor 0 through the righthand armature, normal, of relay A1, righthand armature operated of relay B1, middle `right-hand armature, normal, of relay C1,

The grounded conductor 232 is connected with the fifth impulse stop conductor 5 through the right-hand armature, normal, of relay A2, the right-hand armature, normal, of relay B2, the right-hand armature operated of relay C2, and the corresponding armature, normal, of relay D2.

When the second digit 5 is terminated the resulting impulse of current transmitted over conductor 238 causes the reoperation of relay 202 to shift ground potential from conductors 232 and 252 to conductors 233 and 253. llrom conductor 253 ground potential extends to startconductor 237 via armature 513.

It will be noted that one point inthe connection between the grounded locking' conductor 240. and conductor 210 was broken at the middle right-hand'armature of relay 206 upon the energization of the said relay. Now when relay 202 operates at the end ofthe retransmission of the second line designating digit, it breaks the. remaining connection be tween these two conductors, permitting relay 501, F ig. 5, tofall back. When this ocji curs', a reoperating circuitffor relay 504 is closed at armature 509 including armature 514, operated, and the grounded conductor 220. Relay 504 operates over this ycircuit and connects the conductors 241-244 to the storage relays A11-BR Since the units digit 4 has been registered, and is being held on the relays 211-215, conductors 242 and 243 are grounded by the three operated relays 242-244 (see Fig.- 6). WV hen the grounded conductors 242 and 243 are connected up, the relays B1 and C1 operate to store the" digit. These relays close points in their locking circuit including relay 501, but this locking circuit is'open at this time owing to the fact that conductor 210 has just been ungrounded as above described. However, the initial c ircuit of the storage relays remains closed for the time being;

The digit 3, stored on the tens storage device T is now retransmitted and is terminated responsive to the operation of stop relay 309 over conductor 233, right-hand armature, normal, of relay A3 right-hand armature, operated, of relay B3, middle right-hand armature, normal, of relay C73, and the corresponding armature, normal, of relay D3.

Vhen the output control relay 203 operates at the end of the retransmission of the tens digit 3, it opens, at its middle right-hand armature. the circuit previously closed over conductor 216 and through armatures 512 and 343 operated for the series stepping relay 307. At the same time, relay 203 opens the locking circuit of relay 202,k whereupon relay 202 falls back and replaces .ground on coniuctor 210 so as to completethe locking circuit of relays B1 and()1 through relay 501. A moment later relay 307 falls back and opens the initial circuit of relays B1 and C1 at armature 348, and at armature 313 removes ground from conductor 245, whereupon the locked up relays of the register fall back. When the initial circuit of relays B1 and C1 is opened, relay 501 reoperates and opens the circuit of relay 504 at armature 509, permitting relay 504 to fall back, and ata-rmature 507 it closes a point in the starting circuit including branch conductor 244 so as to permit the sender to operate to send out the fourth and last line designating digit 4.

At the end of the usualk int'erval'following the retransmissionl of the tens digit. 3, the sender starts operating again and retransmitsv the'digit 4 now stored on'the thousands- Y units register. The digit is terminated upon the energization of stop relay 309"overthe fourth impulse stop conductor 4, which is now grounded 'through' the vgrounded con- 'ductor 234, the right-hand armature, nor.- mal, of relay A1,- right-hand armature, operated, of relay B1, and the middle righthand armature, operated, of 4relay C1.' i'

Switching through When theusual impulse of current is transmitted over' conductor 238 to the outputfcon= trol switch at the end of theretransmis'sion of the fourth and last line designating digit, relay 204 is reoperated through its first step and operates throughits second step when the impulse is terminated. At this time ground potential is shifted at the middle lefthand varmature of relay 204- from conductor 230to the switching conductor 235, thereby closing a circuitthrough the normally closed v contacts controlled by armature 340, and armature 346, normal, fory switching relay 303. Relay 303 operates and closes a locking circuit for itself at armature 340, at the same time opening its initial circuit.` At

armature 339, relay 303 disconnects the combined impulse and switching conductor 131 from the repeating relay 305 and connects it to ground, thereby 'short circuiting release relay 105 of the trunk circuit TC and closing a circuit through armature 107 for relay 106. Relay 106 operates and locks Aitself to the release trunk conductor 108 at armature 117, and at armatures 111 and 112 switches the connection through, atthe same time cutting oli' line relay 104' and the control loop extending to the director. This leaves the established connection under the direct control of the calling sub-scriber. Linerelay 107 falls back when it is disconnected and release relay 10.5, being short circuited, falls back a moment later. d

Release, of director. 4.

this occurs, guard relay 301 energiz'esin ythe following circuit: from ground by way of the olf-normal contacts 418 of the office register OR, conductor 227, upper winding of relay 301, .armature 331, normal, and release'relay '302 to battery. The resistance of the upper winding ofthe guard relay is sufficiently 'low lto provide suiiicient current to cause a hunt- ,director selector to pass over the con- .tact set in case it lands thereonV immediately npongthe removal of the original ground potential from the release trunk conductor. Upon operating in this circuit, guard relay i3f0l`fcloses a locking circuit for itself and a 'release circuit for the othce. register at armature 332. Upon the complete operation of relay 301, conductor 132 is disconnected from relay 302 and is connected directlyto ground at armature'331,.and avflashingcircuit is prepared for lamp 338 at armature lWheii relay 302 is disconnected, it itall's bach and shunts the locking contacts of the guard relay at armature 335; it completes the hashing-'circuit for lamp 338 at armature 336, and at armature 337-it removes ground potential Yfrom the locking conductor 240. When this .'occurs, all the locked up relays of the director' with the exception or relay 301 *fall baclr.V

It will be noted that the vlocking circuit of Vthe lower winding of guard krelay 201 in cludes conductor 228, olinormal contacts 407 yot the office register OR', release magnet Li09, and a common supervisory relay. As a result,

jrelease magnet 409 operates in this circuit and restores the ollice register yOR to normal,

whereupon the circuit of release magnet 4:09 `is opened at oil-normal contacts 117, and ott'- normal contacts 4184 disconnect the lower .terminal of the upper winding 01"' relay 301 from ground. l/Vhen its locking circuit is v.opened at contacts 417, relay 301 falls back land reconnects the release trunk conductor register OR is mechanically defective'so that 'it does not restore to normal, guard relay/V301 remains Aoperated and the flashing circuit for lamp 338 remains closed. In. addition, the

supervisory relay common to the release magnets of a number of directors remains operated'and the associated slow alarm device (not shown) operates to sound an alarm. rThe attendant can readily locate the director in Y'trouble by looking .at the lamps, such as 338. l:and noting that the lamp 338 is flashing.

Regarding the etect of the retransmitted the extension of the connection to the desired `oilic'e and to the desired line.

:Whenfthe calling subscriber replaces his 'receiver at the termination of the ensuing conversation, ground potential is removed kfrom the release trunk conductor of the established connection, whereupon the switches are released and relay 106 of the'trunk circuit TC vrfalls back,

Assuming now that acon'tact set in the bank 206 are operated one Vafter another in quick succession to advancethe output control `device through its code digit positions. The advance of the output control device coinmences responsive to the grounding of conductor 219 at the end of the operation oi the i ,ol'lice register, as conductor 219 is'normally connected with the first wiper 401 of the oflice register OR. It will be remembered also that vthe conductor 219 is normally connected with start conductor 238, with the result that the sender starts to operate responsive to the grounding of conductor 219. This does not result in'any harm at this time on account ot the 5tact that stop relay. 309 is operated over conductor 238 to prevent the said sender from operating as long as the skipping operation `is taking place. W'hen the stop relay 309 1falls back at the end of the skipping operation to permit the sender to start, the starting` of the sensei' is held up, in a manner hereinbefore explained, until relay 210 operates at .the end of the storing of the thousands digit and eiects a connection between the -grounded branch conductor 241 and start conductor 24T. 'What is claimed is:

`1. ln a register sender for registering and retransmitting a plurality of digits, a device comprising a plurality of counting relays for Aregistering the digits, an output control dei vice comprising a plurality of counting relays, and a sending device comprising a plurality of counting relays, said sending device being arranged to be controlled by said output control device so that it retransmits the registered digits one after the other in the proper order.

2. In a telephone system, a register sender for registering and retransmitting a plurality lot digits, a sendervcomprising a plurality of counting` relays for-retransmitting the regisytered digits, and an output control device comprising a plurality of counting relays for controlling the senderso thatit -retransmits the registered digits one afterthe Vother in the proper order. i

3. In a telephone system, a trunlrline, a re- Vlease relay in said trunk line, arnuinber regis- ;tering device vfor registering a plurality of digits, an impulse conduct-or extending from said trunk lineV tosaid-registering Ide'vice,V

means for transmitting impulses representing the digits to be registered over said impulse .conductor by shunting said release relay, registers of different characteristics in said registering device eacli being arranged to receive a .different digit of thenuinber to be registered, vand means for maintaining the circuit of the release relay in the trunk circuit constant, regardless,` of theJl differing characteristics of said'register, said means includingl a'repeatiso ing relay arranged to respond to the impulses delivered over said impulse conductor and to repeat said impulses to the registers.

4. In a register sender for registering and retransmitting a plurality of digits, a registering device, a storage device, and a sending device, means for transferringva digit registered'on the registering device to said storage device, means for holding a subsequent digit in said registering device, means for operating said sender toretransmit the digit stored on said storage device, and means for subsequently reoperating said storage` device to store the digit held on said registering device and for again operating thesender under the control of the storage device to retransmit the second digit stored thereon.

5. In a register sender for registering and retransmitting a plurality of digits, a registering device, three storage devices, a sending device, means for operating and releasing the reOister four times to register four digits in a telephone number, means for transferring the first three digits to said storage devices, respectively, and for retaining the fourth digit on said registering device, means for operating said sender yto retransmit the three digits stored under the control of the three registers, respectively, neans forv releasing the iirst storing device responsive to the operation of the sender, the storing means. being again effective to store in the first storage device the digit held on the register, and said sender operating means being effective to operate said sender again under the control of the irst storage device to retransmit the fourth digit stored thereon.

6. In combination, a plurality of counting relays, means for operating said relays to count impulses, for releasing and reoperating certain ones of said relays to count further impulses, and for maintaining one of said relays operated while said certain ones are being reoperated. Y Y

7. In combination, an impulse conductor, and a plurality of counting relays arranged to loperate successively over said conductor, and circuit paths controlled by contacts on said relays for causingthe relays to arrange themselves in any one of twice as many possible combinations as there are relays.

8. In combination, live counting relays, means for operating said r-elays successively to register any number of impulses from one to five, for releasing and suitably reoperat* ing four of the five relays to register from one to live additional impulses, and for maintaining the iifth relay operated while the other four are being reoperated. l

9. The combination including a switching device,means for operating and for releasing the same, and a signal arranged to operate inl one manner while the device is operated and to operate in another manner while the device is being released.

,its

l0.y lIn a telephone system, a switching device having a normal position and av plurality of off-normal positions, means for extending a connection to said switching device, means vfor operating said device to oneV of the off-normal positions aftera connection has been extended to it, means for restoring said Y device to its normal position and vfor breaking said connection, a signalling device, and means for operating said device in one manner while the connection is established and for operating said device in another manner in the interval of time elapsing between the breaking down of the connection and the return of said device to its normal position.

1l. In a telephone system, a trunlr line, a registering device, means for effecting a connection between said trunk vline and said registering device, a relay in said trunk line for severing said connection, means for transmitting digits from said trunk line to said registering device, a circuit for said relay, means for closing said circuit at said'registering device, and means for preventing the closure of said circuit at any time while. a digit is being received.

l2. A register sender for use in multi-olfice telephone systems including: a mechanical step-by-step office register, relay-type registering devices forregistering line designatg ing digits, a relay-type input-control device, a relay-type sender counting device, and a relay-type output-control device.

13. A register sender for use in multi-office telephone systems comprising: a relay-type input control device, a relay-type output control device, va relay-type sending device, a mechanical step-bystep oiiice register, a re* laytype digit register for .registering linedesignating digits consecutively, and digit storing devices for storing the line designatlng digits after they are registered and until they are retransmitted.

lll. In a register controller for receiving oiice designating digits, for retransmitting in accordance therewith the digits necessary to trunk the call to the desired oliice, for receivingline designating digits and for retransmitting them untranslated totrunlr the call to the desired line, amechanical step-'by'- step oiiice register in said registerfsender, and means Aconsisting solely of* relaysfor vperforming the remaining stated functions.

15. In an output-control device of the relay type for controlling they transmission of successive digits from a register sender, two groups of digit-cont-rol conductors extend-V ing from said output control device, means for operating the relays of the device suc-v cessively, each relay of a. plurality of said relays being arranged to connect up a pair of said conductors, one in each group,`certain of said relays'being arranged to reoperate in a second counting operation afterall the relays have been operated once, circ-uit conneclli) lili) tions for maintaining the last relay operated 'continuously after it has operated in response to the irst wave of relay operations, and contacts on the last-named relay for suitably shifting the associated circuit connections so that only conductors of the first grou are eiiective upon being connected before suoli relay operated and only conductors ot the ing relays for associating the storage devices successively with the counting-relay set.

17. In a register sender for use in a telephone system, a sending device for retransmitting a plurality of digits, an output-control device comprising a plurality oi counting relays for controlling the sender so that it retransmits the digits one after the other in the proper order, and means effective in case certain digits are to remain unsent for operating the respective relays corresponding to such digits one after the other in rapid succession.

18. In a sending device for use in a telephone system to transmit a variable plurality of digits successively, a sending device for transmitting the several digits'of a group.4 an output-control device comprising a plurality oi successively operable relays for controlling the sender so that it retransmits the digits one after the other in the proper order, and means effective in case less than the maximum number oi' digits is to be transmitted for operating the relays of theoutput control device in quick succession until such device has passed through the desired number of positions. Y

19. In combination, an impulse conductor, and a plurality of counting relays arranger` to operate successively over said conductor, and circuit paths controlled by contacts on said relays v:tor causing the relays to arrange themselves in any one of more than twice as many possible combinations as there are relays.

20. ln a telephone system, a release relay tor controlling the release oi an established connection, an vimpulse repeating relay for repeating impulses to cause theestablishment of a desired connection, and means for short circuiting said release relay in order to send impulses to said repeating relay.

2l. In a telephone system, a release relay for controlling the release oit an established connection, an impulse repeating relay for repeating impulses vto cause the establishment .of a desired connection, anda line relay controlled over a calling line for short circuiting said release relay in Vorder to send iinpulses to said repeating relay. Y

22. In a telephone system, a release relay for controlling the release ci an established connection, an impulse repeating relay for repeating impulses to cause the establishment of a desired connection, means :toi-short circuiting said release relay in order to sendv impulses to said repeating relay, and an automatic switch included in theconnection between the tvvo relays. A

23. In a telephone system, arelease relay tor controlling the release oi an established connection, a plurality of impulse repeating relays for repeating impulses to cause the establishment oi' desired connections, means for associating said release relay with any one ot said repeating relays, and means for short circuiting said release relay in orderto send impulses to the associated repeating relay. y

24. In a telephone system, a release relay for controlling the release of an established connection, a plurality of magnets arranged to be operated 'to cause the establishment of desired coi-inections, means iior connecting any magnet to said release relay, and means for short circuiting the release relay in order to send impifilses to any connected magnet.

25. In a telephone system wherein a register is set by series of impulses transmitted over a telephone line, a repeating relay in said line for repeating the impulses to the register over an impulse conductor, extending from the line to the register, a repeating relayin the register connected to sai-d conductor and arranged to respond to the impulses received thereover, a tone generating device, a connection to said conductor from said device independent oi' said repeating relay in the register, and means responsive to the operationY ot the last named repeating` relay for opening the connection between said tone generator and said conductor. s

In witness whereof, I hereunto subscribe my name this 16th day oi Gctober, A. D., 1926. RUDOLPH l?. STEHLIK. 

